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From 703920ad5199c46f98cf107c75a2de61608f85fd Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 2 Aug 2019 15:20:11 +0100
Subject: [PATCH] mmc: sdhci-iproc: Fix vmmc regulators on iProc
The Linux support for controlling card power via regulators appears to
be contentious. I would argue that the default behaviour is contrary to
the SDHCI spec - turning off the power writes a reserved value to the
SD Bus Voltage Select field of the Power Control Register, which
seems to kill the Arasan/iProc controller - but fortunately there is a
hook in sdhci_ops to override the behaviour. Borrow the implementation
from sdhci_arasan_set_power.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/mmc/host/sdhci-iproc.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/drivers/mmc/host/sdhci-iproc.c
+++ b/drivers/mmc/host/sdhci-iproc.c
@@ -173,6 +173,17 @@ static unsigned int sdhci_iproc_get_max_
return pltfm_host->clock;
}
+static void sdhci_iproc_set_power(struct sdhci_host *host, unsigned char mode,
+ unsigned short vdd)
+{
+ if (!IS_ERR(host->mmc->supply.vmmc)) {
+ struct mmc_host *mmc = host->mmc;
+
+ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
+ }
+ sdhci_set_power_noreg(host, mode, vdd);
+}
+
static const struct sdhci_ops sdhci_iproc_ops = {
.set_clock = sdhci_set_clock,
.get_max_clock = sdhci_iproc_get_max_clock,
@@ -190,6 +201,7 @@ static const struct sdhci_ops sdhci_ipro
.write_b = sdhci_iproc_writeb,
.set_clock = sdhci_set_clock,
.get_max_clock = sdhci_iproc_get_max_clock,
+ .set_power = sdhci_iproc_set_power,
.set_bus_width = sdhci_set_bus_width,
.reset = sdhci_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
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